#include<iostream>
using namespace std;
int main()
{
    //freopen("in.txt","r",stdin);
    int n,left=0,right=0,now=1,a=1,ans=0;
    cin>>n;
    while(n/a){
        left=n/(a*10),now=n/a%10,right=n%a;
        if(now==0){ans+=left*a;}
        else if(now==1){ans+=left*a+right+1;}
        else{ans+=(left+1)*a;}
        a=a*10;
    }
    printf("%d\n",ans);
    return 0;
}
